RE Vocab (4)
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| crust | thin and solid outermost layer of the Earth above the mantle, thinnest layer, 2 types - oceanic and continental
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| core | central part of the Earth below the mantle - made of iron and nickel, 1/3 of Earth's mass, inner and outer
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| mantle | layer between core and crust, 2/3 of Earth's mass, magma comes from here
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| lithosphere | solid, outer layer consists of crust and upper mantle, divided into plates
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| aesthenosphere | slowly flowing rock on which the plates move
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| mesosphere | middle layer - thickest
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| tectonic plates | blocks of lithosphere, various sizes
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| continental drift | hypothesis that states the continents formed a single landmass, broke up, and drifted to their present locations
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| Pangaea | the most recent supercontinent
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| sea-floor spreading | process by which new magma rises toward the surface, spreading the continents, forming new ocean lithosphere
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| plate tectonics | theory that explains how large pieces of lithosphere move and change shape
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| convergent boundary | where 2 plates come together
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| divergent boundary | where 2 plates move apart
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| transform boundary | where 2 plates slide past one another
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| compression | stress when forces act to squeeze an object,
may cause a reverse fault
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| tension | stress when forces tend to stretch an object,
may cause a normal fault
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| folding | bending of rock layers due to stress
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| fault | break in a body of rock along which there is movement
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| shearing | stress which moves blocks of rock past one another, may cause a strike-slip fault, San Andreas Fault in California
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Created by:
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